Across
1
Biological catalyst
3
Substance with pH below 7
4
Infectious microscopic agent
7
The Red Planet
8
Solid with repeating atomic pattern
11
Our home planet
Down
2
Substance with pH above 7
5
Preserved remains of ancient life
6
Curved glass that refracts light
8
Element found in all living things
9
Fourth state of matter
10
Absolute temperature scale unit